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Bolometer operating at the threshold for circuit quantum electrodynamics.

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Researchers developed a novel graphene bolometer for quantum technology. This highly sensitive thermal sensor achieves nanosecond time constants and excellent energy resolution, meeting critical thresholds for circuit quantum electrodynamics applications.

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Area of Science:

  • Quantum Technology
  • Sensor Development
  • Materials Science

Background:

  • Thermal sensors are vital for applications like gas detection and security.
  • Emerging quantum technologies, particularly circuit quantum electrodynamics, require highly sensitive and fast detectors.
  • Existing thermal sensors have not met the stringent time constant and energy resolution requirements for circuit quantum electrodynamics.

Purpose of the Study:

  • To experimentally demonstrate a bolometer capable of meeting the threshold for circuit quantum electrodynamics.
  • To develop a thermal sensor with a time constant of a few hundred nanoseconds and an energy resolution of approximately 10 Planck constants (h).
  • To leverage novel materials for enhanced bolometer performance.

Main Methods:

  • Utilized a graphene monolayer with extremely low specific heat as the active material for the bolometer.
  • Directly measured the noise-equivalent power and thermal time constant on the same device.
  • Characterized the calorimetric energy resolution based on experimental data.

Main Results:

  • Demonstrated a bolometer operating at the circuit quantum electrodynamics threshold.
  • Achieved a noise-equivalent power of 30 zeptowatts per square-root hertz.
  • Obtained a thermal time constant of 500 nanoseconds, two orders of magnitude shorter than previous limitations, with a minimum observed time constant of 200 nanoseconds.
  • Determined a calorimetric energy resolution of 30 Planck constants (h).

Conclusions:

  • The developed graphene bolometer meets the critical performance thresholds for circuit quantum electrodynamics applications.
  • The sensor's fast response time and high energy resolution enable integration with superconducting qubits and readout schemes.
  • This advancement paves the way for enhanced quantum computing and sensing.